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ovpn2onc.html
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ovpn2onc.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>OpenVPN to ONC</title>
<meta name="description" content="Convert OpenVPN config files to ONC files">
<style>
#output {
background-color: #ddd;
}
#log {
width: 40em;
min-height: 7em;
border: 1px solid black;
overflow-x: auto;
background-color: #eee;
}
#log>p {
margin: 0px;
}
</style>
<script>
/**
* Register the function `handler` to be called when the `Convert` button is
* pressed.
*/
function setHandler () {
let convertButton = document.getElementById('convertbutton')
convertButton.addEventListener('click', handler, false)
}
/**
* Read parameters and pass them to the `main` function. This function is
* called when the `Convert` button is clicked.
*/
function handler () {
let selectedFile = document.getElementById('inputopenvpn').files[0]
let certificates = document.getElementById('inputcertificates').files
let connName = document.getElementById('connname').value
let output = document.getElementById('output')
main(connName, selectedFile, certificates, output)
}
/**
* Return a function that logs text to the log output.
*/
function getLogger () {
let logOutput = document.getElementById('log')
let logger = function (text) {
logOutput.innerHTML += `<p>${text}</p>`
}
return logger
}
/**
* Read, convert and print result. This function calls other functions
* to first read everything, then convert it and finally print the result.
*
* The function is `async` because it uses `await` when reading files.
*
* @param {String} connName Name of the connection
* @param {File} ovpnFile File object for the ovpn file
* @param {Array} certificateFiles List of file objects for the certificates
* @param {Object} output HTML element where the output should go
*/
async function main (connName, ovpnFile, certificateFiles, output) {
log = getLogger()
if (connName === '') {
log('connName is empty')
alert('Please specify a name for the connection.')
return
}
log(`Size of OVPN file: ${ovpnFile.size} bytes`)
let ovpnContent = await readFile(ovpnFile)
let ovpn
let keys
try {
[ovpn, keys] = parseOvpn(ovpnContent)
} catch (err) {
log(err)
return
}
log("Parsed config:")
log(JSON.stringify(ovpn))
for (const certificateFile of certificateFiles) {
keys[certificateFile.name] = await readFile(certificateFile)
}
let onc
try {
onc = constructOnc(connName, ovpn, keys)
} catch (err) {
log(err)
return
}
output.value = JSON.stringify(onc, null, 2)
log('All done!')
}
/**
* Return a promise to read a file as text.
*
* @param {File} file A file object
*
* @return {Promise} A promise with the contents of the file
*/
function readFile (file) {
return new Promise(resolve => {
let reader = new FileReader()
reader.onload = e => {
// callback and remove windows-style newlines
resolve(e.target.result.replace(/\r/g, ''))
}
// start reading
reader.readAsText(file)
})
}
/**
* Parse an OVPN file. Extract all the key-value pairs and keys
* that are written inside XML tags.
*
* The key-value pairs are written into an object. The keys are also
* written into an object with the the XML tag name as the key.
*
* @param {String} str The contents of the ovpn file as a string.
*
* @return {Array} An array that contains the key-value pairs and
* the keys.
*/
function parseOvpn (str) {
log = getLogger()
let ovpn = {}
let keys = {}
// define regexes for properties, opening xml tag and closing xml tag
const reProperty = /^([^ ]+)( (.*))?$/i
const reXmlOpen = /^<([^\/].*)>$/i
const reXmlClose = /^<\/(.*)>$/i
// temporary variables for handling xml tags
let xmlTag = ''
let inXml = false
let xmlContent = ''
let lines = str.split(/[\r\n]+/g)
for (let line of lines) {
// skip line if it is empty or begins with '#' or ';'
if (!line || line.match(/^\s*[;#]/)) {
log(`Skipped line: "${line}"`)
continue
}
if (inXml) { // an XML tag was opened and hasn't been closed yet
const xmlMatch = line.match(reXmlClose)
if (!xmlMatch) {
// no closing tag -> add content to `xmlContent`
xmlContent += line + '\n'
continue
}
const tag = xmlMatch[1]
if (tag !== xmlTag) {
alert('Cannot parse ovpn file.')
throw 'bad xml tag'
}
// closing tag was found
// make sure the tag name and the contents are safe
const name = makeSafe(xmlTag)
const value = xmlContent
// store everything and reset the xml variables
keys[name] = value
ovpn[name] = name
xmlContent = ''
inXml = false
continue
}
const xmlMatch = line.match(reXmlOpen)
if (xmlMatch) {
// an xml tag was opened
inXml = true
xmlTag = xmlMatch[1]
log(`XML tag was opened: "${xmlTag}"`)
continue
}
// check if the line contains a property
const match = line.match(reProperty)
if (!match) continue
// make sure everything is safe and then store it
const key = makeSafe(match[1])
const value = match[2] ? (match[3] || '') : true
ovpn[key] = value
log(`Found: ${key} = ${value}`)
}
log('Finished parsing')
return [ovpn, keys]
}
/**
* Check if string is quoted
*/
function isQuoted (val) {
return ((val.charAt(0) === '"' && val.slice(-1) === '"') ||
(val.charAt(0) === "'" && val.slice(-1) === "'"))
}
/**
* This function is supposed to prevent any exploits via the object keys
*
* It's probably complete overkill.
*/
function makeSafe (val, doUnesc) {
val = (val || '').trim()
if (isQuoted(val)) {
// remove the single quotes before calling JSON.parse
if (val.charAt(0) === "'") {
val = val.substr(1, val.length - 2)
}
try { val = JSON.parse(val) } catch (_) {}
} else {
// walk the val to find the first not-escaped ; character
var esc = false
var unesc = ''
for (var i = 0, l = val.length; i < l; i++) {
var c = val.charAt(i)
if (esc) {
if ('\\;#'.indexOf(c) !== -1) {
unesc += c
} else {
unesc += '\\' + c
}
esc = false
} else if (';#'.indexOf(c) !== -1) {
break
} else if (c === '\\') {
esc = true
} else {
unesc += c
}
}
if (esc) {
unesc += '\\'
}
return unesc
}
return val
}
/**
* Convert the keys from the parsed OVPN file into ONC keys
*
* @param {Object} keys Strings with keys, indexed by key name
* @param {Object} keynames Object with the key names
* @return {Object} ONC parameters and a list of converted certificates
*/
function convertKeys (keys, keyNames) {
let params = {}
// Add certificates
let certs = []
// Server certificate
// TODO: confirm that the type should be 'Authority'
let [cas, caGuids] = constructCerts(keys, keyNames.certificateAuthorities,
'Authority')
params['ServerCARefs'] = caGuids
certs = certs.concat(cas)
// Client certificate
if (keyNames.clientCertificates) {
// TODO: handle other types of client certificates
let [clientCerts, clientCertGuids] = constructCerts(
keys, keyNames.clientCertificates, 'Authority')
params['ClientCertType'] = 'Pattern'
params['ClientCertPattern'] = {
'IssuerCARef': clientCertGuids
}
certs = certs.concat(clientCerts)
} else {
params['ClientCertType'] = 'None'
}
// TLS auth
if (keyNames.tlsAuth) {
let authKey = keyNames.tlsAuth.split(' ')
let keyString = keys[authKey[0]]
if (!keyString) {
alert(`Please provide the file '${authKey[0]}' in 'Certificates and keys'`)
throw `Couldn't find the key for ${authKey[0]}`
}
params['TLSAuthContents'] = convertKey(keyString)
if (authKey[1]) params['KeyDirection'] = authKey[1]
}
return [params, certs]
}
/**
* Convert the parsed ovpn file into the ONC structure
*
* @param {Object} ovpn The parsed OVPN file
* @return {Array} An array with the host and an object with the parameters
*/
function convertToOnc (ovpn) {
if (!ovpn.client) {
console.warn('Is this a server file?')
}
let params = {}
// Add parameters
let remote = ovpn.remote.split(' ')
const host = remote[0]
if (remote[1]) params['Port'] = Number(remote[1])
if (ovpn['auth-user-pass']) params['UserAuthenticationType'] = 'Password'
if (ovpn['comp-lzo'] && ovpn['comp-lzo'] !== 'no') {
params['CompLZO'] = 'true'
} else {
params['CompLZO'] = 'false'
}
if (ovpn['persist-key']) params['SaveCredentials'] = true
if (ovpn['verify-x509-name']) {
const x509String = ovpn['verify-x509-name']
let x509 = {}
if (x509String.includes("'")) {
// the name is quoted with '
const parts = x509String.split("'")
x509['Name'] = parts[1]
if (parts[2]) {
x509['Type'] = parts[2].trim()
}
} else {
const parts = x509String.split(' ')
x509['Name'] = parts[0]
if (parts[1]) {
x509['Type'] = parts[1]
}
}
params['VerifyX509'] = x509
}
// set parameters if they exist in the ovpn config
let conditionalSet = (ovpnName, oncName, type = 'str') => {
if (ovpn[ovpnName]) {
const raw = ovpn[ovpnName]
let value
switch (type) {
case 'int':
value = Number(raw)
break
default:
value = raw
}
params[oncName] = value
} else {
log(`Value for '${ovpnName}' not specified.`)
}
}
conditionalSet('port', 'Port', 'int')
conditionalSet('proto', 'Proto')
conditionalSet('key-direction', 'KeyDirection')
conditionalSet('remote-cert-tls', 'RemoteCertTLS')
conditionalSet('cipher', 'Cipher')
conditionalSet('auth', 'Auth')
conditionalSet('auth-retry', 'AuthRetry')
conditionalSet('reneg-sec', 'RenegSec', 'int')
const keyNames = {
'certificateAuthorities': ovpn['ca'],
'clientCertificates': ovpn['cert'],
'tlsAuth': ovpn['tls-auth'],
}
return [host, params, keyNames]
}
/**
* Construct the ONC structure from the name, the parsed ovpn file and the keys
*
* @param {string} name Name of the connection
* @param {Object} ovpn The parsed OVPN file
* @param {Object} keys Strings with keys, indexed by key name
* @return {Object} The converted ONC structure
*/
function constructOnc (name, ovpn, keys) {
let [host, params, keyNames] = convertToOnc(ovpn)
let [certParams, certificates] = convertKeys(keys, keyNames)
// merge parameters
params = Object.assign({}, params, certParams)
// Put together network configuration
let networkConfiguration = {
'GUID': `{${uuidv4()}}`,
'Name': name,
'Type': 'VPN',
'VPN': {
'Type': 'OpenVPN',
'Host': host,
'OpenVPN': params
}
}
// Put everything together
return {
'Type': 'UnencryptedConfiguration',
'Certificates': certificates,
'NetworkConfigurations': [networkConfiguration]
}
}
/**
* Create UUID (from Stackoverflow).
*/
function uuidv4 () {
return ([1e7] + -1e3 + -4e3 + -8e3 + -1e11).replace(/[018]/g, c =>
(c ^ crypto.getRandomValues(new Uint8Array(1))[0] & 15 >> c / 4).toString(16)
)
}
/**
* Replace newlines with explicit `\n` and filter out comments
*/
function convertKey (key) {
let lines = key.split(/\n/g)
let out = ''
for (let line of lines) {
// filter out empty lines and lines with comments
if (!line || line.match(/^\s*[;#]/)) continue
out += line + '\n'
}
return out
}
/**
* Find all certificates in a string and extract them
*/
function extractCas (str) {
log = getLogger()
let splits = str.replace(/\n/g, '').split('-----BEGIN CERTIFICATE-----')
let cas = []
for (const s of splits) {
if (s.includes('-----END CERTIFICATE-----')) {
let extractedCa = s.split('-----END CERTIFICATE-----')[0]
log("Extracted CA:")
log(extractedCa)
cas.push(extractedCa)
}
}
return cas
}
/**
* Construct certificates in the ONC format
*
* @param {Object} keys Strings with keys, indexed by key name
* @param {string} certName The index for the keys object
* @param {string} certType Type of the certificate: 'Authority', 'Client' or
* 'Server'
* @return {Array} An array of certificates and an array of corresponding IDs
*/
function constructCerts (keys, certName, certType) {
let certs = []
let certGuids = []
if (certName) {
let cert = keys[certName]
if (!cert) {
alert(`Please provide the file '${certName}' in 'Certificates and keys'`)
throw `Couldn't find a certificate for ${certName}`
}
let rawCerts = extractCas(cert)
const format = (certType === 'Authority') ? 'X509' : 'PKCS12'
for (const cert of rawCerts) {
const guid = `{${uuidv4()}}`
certGuids.push(guid)
let oncCert = {
'GUID': guid,
'Type': certType
}
oncCert[format] = cert
certs.push(oncCert)
}
}
return [certs, certGuids]
}
</script>
</head>
<body onload="setHandler()">
<div>
<h1>ovpn2onc</h1>
<ul>
<li>
<label for="connname">Name for connection (can be chosen freely):</label>
<input type="text" id="connname">
</li>
<li>
<label for="inputopenvpn">OpenVPN config file (*.ovpn):</label>
<input type="file" id="inputopenvpn">
</li>
<li>
<label for="inputcertificates">Certificates and keys (can be multiple files):</label>
<input type="file" id="inputcertificates" multiple>
</li>
</ul>
<button id="convertbutton" type="button">Convert</button>
</div>
<div>
<p><b>Output</b> (copy this into a new file and load it in ChromeOS)</p>
<textarea readonly id="output" wrap="off" rows="40" cols="100"></textarea>
</div>
<div>
<p> </p>
<p> </p>
<p>Debugging info:</p>
<div id="log"></div>
</div>
</body>
</html>